Canon perpetuus op.10, 1968 – versia on the Martti Porthan Organ

Glass & Grigny on the Porthan Organ (SPb)

Urkurakentamo Veikko Virtanen

Monitoimitalo Riimin urkujen rakentaminen

Pispalan urut

Olli Porthan - J.S.Bach, Gelobet seist du, Jesu Christ (BWV 604)

Organ Talk: "I just adore its flute stops" (Marina Väisä on the organ of the Mariinsky Concert Hall)